Looking good so far. You can put those lights much closer though, to where they are almost touching (as long as they are cool white bulbs). As far as 2 plants in 1 container....don't worry about it now. With that much room, yea you probably should have used 2 containers, but o well. I have done this many of times and have NEVER had a problem. LOL, I know a lot of people get real bent out of shape when they see that, I love it. "What!!!!??? He has 2 plants in 1 container!! NOOOOOOOOOOOOO!!!!" I just harvested 3 plants that were in 1 container because of the lack of space and all were fine and plants looked amazing at the end!!
BUT..........if you have the space, don't take the chance. I am a little restricted, but have NEVER had a problem concerning the roots getting tangled. They have and will cross eventually, but there was never a battle. I just pulled out the roots after cutting down the plants, and they criss crossed like crazy, but all was good!! Good luck on your grow!!